Editing 1780 (section)

=== January&ndash;March ===
* [[January 16]] &ndash; [[American Revolutionary War]] &ndash; [[Battle of Cape St. Vincent (1780)|Battle of Cape St. Vincent]]: British Admiral [[George Brydges Rodney, 1st Baron Rodney|Sir George Rodney]] defeats a Spanish fleet.
* [[February 19]] &ndash; The legislature of New York votes to allow its delegates to cede a portion of its western territory to the Continental Congress for the common benefit of the war.<ref name="Harper1780">{{cite book|title=Harper's Encyclopaedia of United States History from 458 A.D. to 1909|editor1=Lossing, Benson John|editor2=Wilson, Woodrow|location=New York|publisher=Harper & Brothers|year=1910|page=166}}</ref>
* [[March 1]] &ndash; The legislature of [[Pennsylvania]] votes, 34 to 21, to approve [[An Act for the Gradual Abolition of Slavery]].<ref name=Ferguson>{{cite book|first=Russell J.|last=Ferguson|title=Early Western Pennsylvania Politics|year=1938|page=34}}</ref>
* [[March 11]]
** The [[First League of Armed Neutrality]] is formed by [[Russian Empire|Russia]] with [[Denmark]] and [[Sweden]] to try to prevent the British [[Royal Navy]] from searching neutral vessels for contraband (February 28 [[Old Style and New Style dates|O.S.]]).
** General [[Gilbert du Motier, Marquis de Lafayette|Lafayette]] embarks on {{ship|French frigate|Hermione|1779|6}} at [[Rochefort, Charente-Maritime|Rochefort]], arriving in [[Boston]] on [[April 28]], carrying the news that he has secured French men and ships to reinforce the American side in the [[American Revolutionary War]].
* [[March 17]] &ndash; [[American Revolutionary War]]: The British [[San Juan Expedition (1780)|San Juan Expedition]] sails from Jamaica under the command of Captains John Polson and [[Horatio Nelson]] to attack the [[Captaincy General of Guatemala]] (modern-day Nicaragua) in [[New Spain]].
* [[March 26]] &ndash; The ''British Gazette and Sunday Monitor'', the first Sunday newspaper in Britain, begins publication.